Enhancement of intrinsic guanine fluorescence by protonation in DNA of various structures

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-03-04 DOI:10.1016/j.biochi.2024.03.003

Liana L. Tevonyan , Natalia P. Bazhulina , Dmitry N. Kaluzhny

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Abstract

Understanding the diversity of DNA structure and functions in biology requires tools to study this biomolecule selectively and thoroughly. Fluorescence methods are powerful technique for non-invasive research. Due to the low quantum yield, the intrinsic fluorescence of nucleotides has not been considered for use in the detection and differentiation of nucleic acid bases. Here, we have studied the influence of protonation of nucleotides on their fluorescence properties. We show that protonation of ATP and GTP leads to enhanced intrinsic fluorescence. Fluorescence enhancement at acidic pH has been observed for double-stranded DNA and single-stranded oligonucleotides. The formation of G4 secondary structures apparently protected certain nucleotides from protonation, resulting in less pronounced fluorescence enhancement. Furthermore, acid-induced depurination under protonation was less noticeable in G4 structures than in double-stranded and single-stranded DNA. We show that changes in the intrinsic fluorescence of guanine can be used as a sensitive sensor for changes in the structure of the DNA and for the protonation of specific nucleotides.

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不同结构 DNA 中质子化作用对鸟嘌呤本征荧光的增强。

要了解 DNA 结构和功能在生物学中的多样性，就需要有选择性地深入研究这种生物大分子的工具。荧光方法是一种强大的非侵入性研究技术。由于量子产率低，核苷酸的本征荧光尚未被考虑用于检测和区分核酸碱基。在此，我们研究了核苷酸质子化对其荧光特性的影响。我们发现，ATP 和 GTP 的质子化会导致本征荧光增强。我们观察到双链 DNA 和单链寡核苷酸在酸性 pH 值下的荧光增强。G4 二级结构的形成显然保护了某些核苷酸免于质子化，从而使荧光增强不那么明显。此外，与双链和单链 DNA 相比，G4 结构在质子化作用下的酸诱导去质子化作用不那么明显。我们的研究表明，鸟嘌呤固有荧光的变化可作为 DNA 结构变化和特定核苷酸质子化的灵敏传感器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567